TOMATECH AUTOMATION
1.3.2 Machine coordinate system, Machine Zero and machine reference point
Machine tool coordinate system is a benchmark one used for CNC counting
coordinates and a fixed one on the machine tool. Machine tool zero is a fixed point which
position is specified by zero switch or zero return switch on the machine tool. Usually, the
zero return switch is installed on max. stroke in X, Z positive direction. Machine reference
point is located at the position at which the machine zero value adding the data parameter
No.114/No.115 value. When No.114/No.115 value is 0,the machine reference point
coincides with the machine zero. The coordinates of machine reference point is the
No.120/No.121 value. Machine zero return/G28 zero return is to execute the machine
reference point return. After the machine zero return/machine reference point return is
completed,TAC-1002T machine coordinate system which takes No.120 value as the
reference point, which is referred to I Programming, Section 3.13.
Note: Do not execute the machine reference point return without the reference point switch
installed on the machine, otherwise, the motion exceeds the travel limit and the machine to be
damaged.
1.3.3 Workpiece coordinate system and Program Zero
The workpiece coordinate system is a rectangular coordinate system based on the part
drawing,also called floating coordinate system. After the workpiece is installed on the
machine, the absolute coordinates of tool’s current position is set by G50 according to the
workpiece’s measure, and so the workpiece coordinate system is established in CNC.
Generally, Z axis of the workpiece coordinate system coincides with the spindle axis. The
established workpiece is valid till it is replaced by a new one. The system can set 6
workpiece coordinate systems G54~G59 in advance. Refer to I Programming, Section
3.18 about the details of workpiece coordinate system.
A sub workpiece coordinate system is created in a workpiece coordinate system, which is
called as a local coordinate system. Refer to I Programming, Section 3.17 about the
details of the local coordinate system.
The current position of workpiece coordinate system set by G50 is the program zero.
Note: Do not execute the machine reference point return without using G50 to set the workpiece
coordinate system after power on, otherwise, the alarm occurs.
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